Install on GEOM mirror

[G.D. Wusser Esq.]

It seems like I am having the same issue described in the following thread:
https://forum.pfsense.org/index.php?topic=61812.0

Trying custom install, creating GEOM mirror from two disks of the same size and model, installing to the mirror; after the step to select the swap partition, installation starts, and then hangs at 38%.

The screen is stuck at:

Executing Commands
/usr/local/bin/cpdup -vvv -I -o /usr /mnt/usr
The spinner is spinning, but the progress is stuck at 38%.

How do I go past this?

[G.D. Wusser Esq.]

Ok, found it on another thread: remove network cables before install.